參數(shù)資料
型號： TPS40090PWRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PDSO24
封裝： GREEN, PLASTIC, TSSOP-24
文件頁數(shù)： 2/31頁
文件大?。?/td> 881K
代理商： TPS40090PWRG4
www.ti.com
t
SS +
0.7
C
SS
5
10*6
(2)
t
PG + 1.43
T
SS
(3)
OUTPUT VOLTAGE PROGRAMMING
V
OUT + 0.7 V
R1
R2 )
1
(4)
CURRENT SENSE FAULT PROTECTION
OVERVOLTAGE PROTECTION
SLUS578B – OCTOBER 2003 – REVISED MAY 2006
APPLICATION INFORMATION (continued)
When the BP5 pin voltage crosses its lower undervoltage threshold and the power-on reset function is cleared,
the calibrated current source starts charging the soft start capacitor. The PGOOD pin is held low during the start
up. The rising voltage across the capacitor serves as a reference for the error amplifier assuring start-up in a
closed loop manner. When the soft start pin voltage reaches the level of the reference voltage V
REF = 0.7 V, the
converter's output reaches the regulation point and further rise of the soft start voltage has no effect on the
output.
When the soft-start voltage reaches level of 1 V, the power good (PGOOD) function is cleared and reported on
the PGOOD pin. Normally, the PGOOD pin goes high at this moment. The time from when SS begins to rise to
when PGOOD is reported is:
The converter output voltage is programmed by the R1/R2 divider from the output of the differential amplifier.
The center point of the divider is connected to the inverting output of the error amplifier (FB), as shown in
Multiphase controllers with forced current sharing are inherently sensitive to failure of a current sense
component. In the event of such failure, the whole load current can be steered with catastrophic consequences
into a single channel where the fault has happened. The dedicated circuit in the TPS4009x controller prevents it
from starting up if any current sense pin is open or shorted to ground. The current-sense fault detection circuit is
active only during device initialization, and it does not provide protection should a current-sense failure happen
during normal operation.
If the voltage at the FB pin (VFB) exceeds VREF by more than 16%, the TPS4009x enters into an overvoltage
state. In this condition, the output signals from the controller to the external drivers is pulled low, causing the
drivers to force all of the upper MOSFETs to the OFF position and all the lower MOSFETs to the ON position.
As soon as VFB returns to regulation, the normal operaing state resumes.
10
相關(guān)PDF資料
PDF描述
TPS40091PWG4 SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PDSO24
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS40090-Q1 制造商:TI 制造商全稱:Texas Instruments 功能描述:HIGH-FREQUENCY MULTIPHASE CONTROLLER
TPS40090QPWRQ1 功能描述:DC/DC 開關(guān)控制器 Hi-Freq Multiphase Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
TPS40090RHDR 功能描述:DC/DC 開關(guān)控制器 4 Ch Multiph Buck DC/DC Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
TPS40090RHDRG4 功能描述:DC/DC 開關(guān)控制器 4Ch Multiphase Buck DC/DC Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
TPS40090RHDT 功能描述:DC/DC 開關(guān)控制器 4Ch Multiphase Buck DC/DC Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
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